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List:       openbsd-tech
Subject:    [PATCH] renumber CARP virtual host ID range
From:       Job Snijders <job () instituut ! net>
Date:       2014-05-08 13:33:03
Message-ID: 20140508133303.GB9366 () Eleanor ! local
[Download RAW message or body]

Hi all,

Following a discussion on the NANOG mailing regarding the overlap
between MAC addresses assigned to VRRP [1] and virtual host IDs as used
in the CARP protocol, it was suggested to use a range dedicated to CARP
[2]. Ytti assigned 74-66-30-FF-FE-00 .. 74-66-30-FF-FE-FF.

* Improve coexistence with other redundancy protocols
* Patch does not provide backwards compatibilty

Kind regards,

Job

[1]: http://www.iana.org/assignments/ethernet-numbers
[2]: http://mailman.nanog.org/pipermail/nanog/2014-May/066959.html

===================================================================
RCS file: /cvs/src/sys/netinet/ip_carp.c,v
retrieving revision 1.229
diff -u -r1.229 ip_carp.c
--- src/sys/netinet/ip_carp.c   30 Apr 2014 10:04:33 -0000  1.229
+++ src/sys/netinet/ip_carp.c   8 May 2014 13:18:50 -0000
@@ -1759,16 +1759,19 @@
 carp_set_vhe_enaddr(struct carp_vhost_entry *vhe)
 {
    struct carp_softc *sc = vhe->parent_sc;
-
+
+    /* CARP MAC range donated by Saku Ytti
+       http://ytti.fi/.well-known/iru/obsd-carp.txt
+    */
    if (vhe->vhid != 0 && sc->sc_carpdev) {
        if (vhe->vhe_leader && sc->sc_balancing == CARP_BAL_IP)
-           vhe->vhe_enaddr[0] = 1;
+           vhe->vhe_enaddr[0] = 0x75;
        else
-           vhe->vhe_enaddr[0] = 0;
-       vhe->vhe_enaddr[1] = 0;
-       vhe->vhe_enaddr[2] = 0x5e;
-       vhe->vhe_enaddr[3] = 0;
-       vhe->vhe_enaddr[4] = 1;
+           vhe->vhe_enaddr[0] = 0x74;
+       vhe->vhe_enaddr[1] = 0x66;
+       vhe->vhe_enaddr[2] = 0x30;
+       vhe->vhe_enaddr[3] = 0xff;
+       vhe->vhe_enaddr[4] = 0xfe;
        vhe->vhe_enaddr[5] = vhe->vhid;

        vhe->vhe_sdl.sdl_family = AF_LINK;

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